Originally Posted by
OskiBear
So, dumb question: countries that don't do outgoing passport control, how would they know? I seem to recall that US and UK don't do this (at least in my experience).
When I enter the US the border staff staple an I94 into my passport. When I leave the US the I94 is usually collected by the airline staff prior to boarding the international flight. If I overstayed I expect they would notice.
And I suspect the US know when you leave (by commercial flights) anyway, based on:
https://help.cbp.gov/app/answers/detail/a_id/752